APA (7th ed.) Citation

Aller, L. H., & Kaler, J. B. (1964). Spectrophotometric studies of gaseous nebulae I: The double-ring planetary NGC 7009. University of California.

Chicago Style (17th ed.) Citation

Aller, Lawrence Hugh, and James B. Kaler. Spectrophotometric Studies of Gaseous Nebulae I: The Double-ring Planetary NGC 7009. Los Angeles: University of California, 1964.

MLA (9th ed.) Citation

Aller, Lawrence Hugh, and James B. Kaler. Spectrophotometric Studies of Gaseous Nebulae I: The Double-ring Planetary NGC 7009. University of California, 1964.